Cascaded tilted fiber Bragg grating for enhanced refractive index sensing<xref rid="cpb_27_11_114220_fn1" ref-type="fn">*</xref><fn id="cpb_27_11_114220_fn1"><label>*</label> <p>Project supported by the National Natural Science Foundation of China (Grant Nos. 61775182 and 61505165) and Marie Skłodowska-Curie Individual Fellowships in the European Union’s Horizon 2020 Research and Innovation Programme (Grant No. 660648).</p></fn>

Cascaded tilted fiber Bragg grating for enhanced refractive index sensing**

Project supported by the National Natural Science Foundation of China (Grant Nos. 61775182 and 61505165) and Marie Skłodowska-Curie Individual Fellowships in the European Union’s Horizon 2020 Research and Innovation Programme (Grant No. 660648).

Jiang Biqiang^{1, 2, †}, Bi Zhixuan¹, Wang Shouheng¹, Xi Teli¹, Zhou Kaiming², Zhang Lin², Zhao Jianlin¹

(color online) (a) Measured transmission spectra of the cascaded TFBG (top with red line) and the TFBGs (bottom) with the same tilt angle in SMF (with magenta line) and RD-SMF (with blue line); (b) separations of adjacent cladding mode resonances at different wavelengths of the TFBGs.